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Macaulay Culkin is reacting to the sudden death of his "Home Alone" costar Catherine O'Hara ... and he's lamenting the fact he won't see her again in this life.

The "Home Alone" star took to Instagram on Friday to share a tribute to Catherine, who played his mom in the two original Christmas classics.

Macaulay shared a photo of him and Catherine from the end of the OG "Home Alone" and another shot of them later in life, from the same angle as the movie still.

Catherine O’Hara filled plenty of roles in her time ... and she earned herself more than a few fans during her career as an actress, in which she appeared in productions like "Schitt's Creek" and "Home Alone."

We’re going to take a look back at the performer's career and see what she accomplished professionally in the years prior to her 2026 death.

Catherine was born in 1954 in Toronto, Canada, and she grew up in a large family in the Toronto suburb of Etobicoke.

She began her acting career in the 1970s, when she joined The Second City -- a historic improv comedy enterprise -- in Toronto.

Catherine started out in showbiz by filling bit parts in various TV shows and made-for-TV movies, according to her IMDb page.

Her big break came in 1976, when she started appearing in The Second City’s sketch comedy show “SCTV,” and she remained with the show for three years alongside other future stars like John Candy and Rick Moranis.

Catherine switched back and forth between TV and film work throughout her career, and she gained exposure after being featured in flicks like “After Hours” and “Beetlejuice.”

She wasn’t exactly averse to appearing in sequels, either ... because she reprised her role as Kate, the mother of Macaulay Culkin’s character from the 1990 film “Home Alone,” in the movie’s 1992 sequel.

Catherine didn’t mind waiting more than a few years for a sequel, either ... because she agreed to reprise her role as Delia from “Beetlejuice,” which was released in 1988, for its sequel -- which was released 36 years later.

And speaking of “Beetlejuice” -- Catherine met her husband, Bo Welch, on the set of the flick and Tim Burton encouraged him to ask her out ... they married in 1992, and they welcomed sons Matthew and Luke in 1994 and 1997, respectively.

Catherine’s career had always been steady ... and it received a serious boost in popularity in 2015, when she joined the cast of “Schitt’s Creek,” which was co-created by her old Second City castmate, Eugene Levy.

She filled the role of Moira Rose, a former soap opera star who was forced to deal with her family’s loss of fortune ... and she remained with the show for the entirety of its 80-episode run.

Catherine was put up for a duo of Primetime Emmy Awards for her work in the show ... and she took home the Emmy for Outstanding Lead Actress in a Comedy Series in 2020.

It’s also worth mentioning, she received a Golden Globe Award for Best Actress - Television Series Musical or Comedy the same year.

We revealed Catherine had died at the age of 71 in January 2026 ... her cause of death wasn’t publicly revealed.

Billy Bob Thornton was stuck bracing for a nor'easter in New Jersey this week, but he didn't let that stop him from making an appearance at a benefit show in Los Angeles ... as the actor took the stage by FaceTime.

Here's the backstory ... Billy Bob and country crooner Dwight Yoakam have been friends for decades and starred in the 1996 classic flick "Sling Blade" together. Billy was set to host Dwight's event benefitting Children's Hospital L.A., but he's currently out of town shooting the movie "Somedays" with Ariana Greenblatt. Sadly, weather didn't permit him to travel.

Determined to still make it somehow, Billy called Dwight's phone, which was then brought on stage in the middle of Dwight's performance at The Roxy Theatre in West Hollywood.

If you were getting all pumped about seeing Odessa A'zion in the upcoming romance drama flick "Deep Cuts," this might be a bummer -- she's dropped out of the movie's cast.

The actress explained her reasoning on her Instagram Story on Wednesday night ... and admitted she didn't realize the character she was set to play, Zoe, was of Mexican and Jewish heritage in the 2025 novel the upcoming A24 movie is based on.

Odessa's casting was announced Monday, and fans of the book started posting online about how her own background -- she's Jewish, but does not have Mexican roots -- doesn't fit with the character, according to Variety.

"Wuthering Heights" is sure to get hearts pounding when it drops right before Valentine's Day ... especially if the energy on the red carpet is any indication!

The film version of Emily Brontë's classic novel had its world premiere at the TCL Chinese Theatre Wednesday night ... with Jacob Elordi and Margot Robbie taking center stage as they walked into the event.

Check out the snaps ... Elordi and Robbie gazed tenderly at each other in a preview of the quiet moments from the upcoming film.

Ads for Melania Trump's documentary "Melania" have been getting a lot of attention in L.A. ... but not in a good way. The city's public transit agency has reported a huge rise in vandalism on buses and at stops featuring the First Lady's face.

Defaced with expletives, Adolf Hitler mustaches, and references to Hitler's wife Eva Braun, "Melania" posters are getting tagged at bus stops all over the city, sending LA Metro officials into panic mode.

According to L.A.'s NBC4, the agency is scrambling to reassign buses with "Melania" posters ... bus stops featuring the promos have also been vandalized, though Metro does not oversee the stops.

Paul Dano is speaking out about Quentin Tarantino dissing him as an actor, saying he's grateful his colleagues stuck up for him.

Dano addressed the Tarantino issue Wednesday while he and his fellow cast members from the movie “Little Miss Sunshine” celebrated the 20th Anniversary of its release at the Sundance Film Festival.

Responding to the droves of people defending him online, the actor told Variety, “That was really nice. I was also incredibly grateful that the world spoke up for me so I didn’t have to."

Last December, Tarantino torched Dano during an interview with Brett Easton Ellis on "The Bret Easton Ellis Podcast."

Halle Berry came to turn heads, and mission accomplished.

The actress stole the spotlight at the "Crime 101" premiere in London on Wednesday, stepping out in a show-stopping look that was impossible to ignore.

Berry rocked a plunging black bodysuit paired with a silver, bejeweled maxi skirt that shimmered under the lights and hugged her silhouette perfectly. The bold combo struck the ideal balance between sleek and glamorous, making it clear she understood the assignment.

Move out of the way Angelina Jolie and Brad Pitt ... it's Pax's time to shine -- 'cause TMZ has learned their son is following in their movie-making footsteps!

That's right ... Pax, who was adopted by the famed actors in 2007, headed to the Sundance Film Festival in Utah for a private screening of the thriller "Self Custody" over the weekend, where he rubbed elbows with the film's co-directors Fernando Ferro and Garrett Patten.

A source tells TMZ ... Pax is getting into producing movies and has been in discussions with Ferro and Patten on a few future projects. He did not work on the film, but was invited by them and we're told the 22-year-old is doing "extremely well."

Mexican actor Alexis Ortega -- best known as the Latin American voice of Spider-Man -- has died.

The news about Ortega's death was announced by World Dubbing News on Tuesday. His cause of death wasn't immediately disclosed.

Ortega was born in Mexico in 1987, and he began his career as both an onscreen performer and voice actor in 2013, reports El Mundo America.

He eventually began dubbing over Tom Holland in various Marvel productions, including "Spider-Man: Homecoming" and "Avengers: Infinity War."

Ortega worked on several Disney movies, and provided Spanish dubbing for movies like "Big Hero 6" and "Star Wars: Rogue One."

The actor was also featured onscreen in shows like "Luis Miguel: The Series" and "La Casa de las Flores."

He reportedly worked in dubbing for social media content, and on projects for MrBeast.

Ortega was 38 years old.

Ernie Hudson is filling in for the late Carl Weathers by voicing Combat Carl in the upcoming "Toy Story 5" ... but Ernie told us he was the last to know!

We caught up with the 80-year-old actor Monday outside NBC in NYC, where we asked him when he found out he was taking over for Carl.

He answered ... "Not until I actually started working. And the studio didn't tell me but the fans did. The fans are amazing. They know more than I do."

Having watched all of the "Toy Story" movies, Ernie said, "I was very happy to be included but I didn't know I was stepping in for Carl, who was a good friend."

Celebs are flocking to Utah for one last take at the Sundance Film Festival before it packs up and moves to Colorado ... and it's not just movie stars wrapping things up.

Seth Rogen, Edward Norton, and Olivia Wilde have boots on the ground in Park City ... along with Giselle Bonilla, Alexander Heller, Will Brill and Rob Lowe.

Billy Magnussen is having a grand ole' time ... and even Prince Harry and Meghan Markle are in the mix.

Margot Robbie is cruising full-speed on her "Wuthering Heights" promo tour with Jacob Elordi ... and if their interview rounds don't already scream chemistry, these TMZ pics definitely do!

Peep these B&Ws snapped by street photographer Rene Mascarenas, who just happened to be stuck in traffic with them on L.A.’s famed Sunset Boulevard -- he asked for a pic, and they happily obliged ... 'cause LBR, when you look that good together, you never pass up free proof.

The pair looked every inch the movie stars -- Jacob behind the wheel, his fellow Aussie riding shotgun, both in a great mood ... especially after Rene told Jacob he crushed it in "Frankenstein" and tossed Margot a compliment for good measure.

American actress Cybill Shepherd was in her mid 20s when she played opposite Robert De Niro as Betsy in the Martin Scorsese classic "Taxi Driver" back in 1976.

Real quick while we gotcha, can you find the hidden word below? "Taxi Driver" is your clue:

It's finally that time of the year again, folks, and you probably need a brush-up on who got put up for an Academy Award ... can you guess who this Oscar-nominated actor is?

We ran into this star right after he got off a crazy weather-delayed flight back in 2018 ... he had a lot to say about the "bomb cyclone" and climate change -- and it's particularly relevant again as half the country's facing freakishly frigid weather this week!

Lots of celebs had funky jobs before they made it big in the 'biz ... can you guess who this former male stripper is?

We ran into this star while he was leaving LAX back in 2015 and asked him what his favorite song to dance to was ... but we guess some things are better kept secret.